Method of making multiple core boxes



June 1-6, 1931. J; H. LAuKEL 1,310,523

METHOD OF MAKING MULTIPLE CORE BOXES Filed April 2, 1930 INVENTOR ATTORN EY Patented June 16, 193i,

J'OEN' H. LAUREL, 01 DETROIT, MICHIGAN METHOD OF MARIN G HULTIPLE CORE BOXES Application filed April 2, 1980. Serial No. 441,125.

The present invention pertains to a novel method of producing a multiple core box by electro deposition.

As well known in the art, a core box is ordinarilylaccompanied by a set of core driers into w oh the cores are transferred from the core box after bein molded therein and after removing one of t e halves of the core box. In other words, the core drier is laid over the half of the core which is exposed by removal of half of the core box, and then both the box and the drier are inverted, after which the half of the core box formerly helding the core is lifted so that the core remains seated in the drier. It will be readily understood that if a core box for simultaneousl producing a number of cores werevprovided, 1t would be necessary that the drier to receive the cores should have the core seats or pockets an located exactly in register with the correzponding seats or pockets of the core box. therwise, in case of misalinement, at least some of the cores would not be properly received in the drier and would be mutilated 215 in the attempted transfer from core box to core drier.

From a practical and economical standpoint it is exceedingly diflicult and expensive y present methods to form one or more mulo tiple core boxes-that will re ter accurately with the core driers. Consi era'ble skill and accurate work are necessary in making driers that will accurately fit the core boxes, and the expense involved is almost always prohibitive.

The formation of the working surface of a multiple core box by electro deposition lends itself to the production of a core box which is accurate with'respect to the drier. Ac-

tion of the multiple core box is constructed from cores set in the core drier as a guide so that the core seats in the deposited box register perfectly with those of the drier. Cores cording to the invention, it is necessary to 7 made in the deposited core box may therefore a be transferred readily to the core'drier without risk of mutilation.

, manner of form and core drier pattern over a lurality of half cores;

igure 2 is a sectional view illustrat' the manner of locating cathode bodies respect to the core drier;

Figure 3 is a sectional view illustrating the manner of fixing the cathode bodies on a cathode base; a

Figure 4 is a section showing the manner of similarly assembling the cathode for the other half of the core box; A

Figure 5 is a sectional view of a completed cathode; T

Figure 6 is a detail section of a cathode with a deposit thereon.

Reference to these views will now be made by (pee of like characters which artiemplfiyed to esignate corresponding" parts oug out. {5

As already indicated, the core box is built with reference to the core drier, and in Figure 1 is illustrated the first step in the formation of the drier. A plurality of half cores 1 made from a perfect single cavity core box 1 are laid upon a base 2 in the relation in which it is desiredto have the core recei pockets in the core driers and core box. ese half cores have dowel holes 1' to receive dowel pins for holding the half cores in matched 35 relation when necessary, as will presently appear. A pattern 3 is molded over the sec tions 1 in any suitable manner, as by pouring plaster of Paris over the sections and trimming it after setting to the form desired for the pattern. The wall 4 of the pattern may conveniently be made of strips of wood.

From the pattern is cast the desired num- 7 her of core driers, one of which is indicated by the numeral 5 in Figure 2. The corners 6 of the core pockets are relieved, for a purpose well known in the art, by similarly relievin the corners of the original attern.

It may stated in this connection t at if a j number of driers is desired, a metal pattern 5 adapted to hold the counterparts 8 in the' same relative position as the half cores 1 on" is made from the original pattern, and the driers are cast from the metal pattern.

The core drier 5 is now turned face up, and the half cores 1 are seated therein. In order to maintain the half cores firmly in proper position, the relieved parts of the drier are filled with a plastic substance 7. Thehalf sections 1 are associated with matched counterpart sections 8 which are now laid upon the sections 1 in matched registration therewith vand fixed thereto by any suitable means such as dowel pins in the holes 1'. Over the counter parts 8 is formed a cast 9 of any suitable material, such asplaster of. Paris,

which they are mounted. Holes 10 are drilled from the top of the cast 9 through the matched core sections, preferably at the core prints, and then through the core drier as indicated by the numeral 11. These holes are tapped where passing through the cores as indicated by the numeral 12.

The purpose of the cast 9 is to enable removal of thecounterparts 8 without destroying the relation which has been determined by the core drier. The cast is then removed and placedupon a slab 13 which is to constitute the base or carrier of a cathode. The drilled holes 10 are extended through the slab as at 14, for example, by sinking a drill into the holes and working it through the slab, or by spotting on the top of the slab,

' removing the cast and cores, and drillin from the spots. At the base of the slab a countersink 15 is formed at each hole 14, and a headed screw 16 is inserted from the countersink in each hole and threaded into the superposed core section 8. The cast 9 is now ready for removal from the core sections, which is enabled b oiling the sections prior to the formation 0 the slab thereon. In this manner there is formed a body similar to that shown in Figure 5 and on which the half cores are located in the same relation as' the core pockets in the drier.

In like manner the drier 5 containing the fsections '1 is inverted upon a slab 17 which is to constitute the base of the'cathode for the deposition of the other half of the core box. Holes 18 are drilled in the slab 17 in alinement with the'holes 10 in the drier and consist of plaster which is impregnated to resist attack by the bath and renderd conductive where deposition is desired. As an alternative, the core sections may originally be formed of a low melting metal which requires no metalization for plating and which is readily removed from the deposit by fusing. In either case, the countersinks 15 are plugged with an insulating material 21 to avoi The dowel holes 1' are plugged with conducting material. It is also preferred to apply a metal face plate 22 upon the slab and around the margins of the core sections as described in the pending application of Arthur K. Laukel, Serial No. 101,069 filed April, 1926.

Figure 6 illustrates a portion of one of the cathodes in the rocess of deposition. A metal shell 23 is eposited over the core secbox. When a suflicient thic plating on the heads of the screws.

been deposited, the shell is backed or rein upon the holes thus formed constitute locating means. Locating pins may be fixed in the holes of one of the core box partsto register with the holes in the other part.

Inasmuch as the core cavities in the core box are located in perfect registration with the core seats in the drier, it becomes possible to transfer the cores from the box to the drier without difliculty, and the above mentioned difficulties inthe making of the multiple core box by ordinary casting and machining methods are overcome. g Although a specific embodiment of the invention has been illustrated and described, it

will be understood that various alterations 7 vention as indicated by the appended claims. l

, What I claim is:

1. A method of making amultiple core box consisting in fitting a plurality of split'cores in a multiple core drier, locating the counterparts of said split cores in matched registration upon the first named split cores, forming a cast over said counterparts, laying said cast with the counterparts therein upon a slab, securing said counterparts upon said slab in the position maintained by said cast, with the parting faces engaging the slab, removing said cast, and preparing said counterparts and slab for immersion'in a plating bath for electro deposition on said counterparts.

2. A method of making a multiple core box consisting in fittin a plurality of split cores in a multiple core rier, locating the counterparts of said split cores in matched registra tion upon the bottoms of the first named split cores, forming a cast over said counterparts, laying said cast with the counterparts therein upon a slab, securing saidcounterparts upon said slab in the position maintained by said cast with the parting faces engaging said slab,qremoving said cast and preparing said counterparts and slab for immersion in a plating bath for electro deposition on said 7 counterparts, laying the core drier with the first named split cores therein upon another slab, andsimilarly securing said split cores upon said slab, removing the drier from said split cores, and preparing the slab and split cores for immersion in a plating bath and for electro deposition upon said split cores.

3. A method of preparing a cathode for the electro deposition of the working surface of a multiple core box consisting in laying out a'plurality of split cores, molding a pattern of a core drier over said split cores, casting a core drier from said pattern, fitting said split cores in said drier, locating the counterparts of said split cores in matched registration upon said split cores, forming a cast over 7 said counterparts,-laying said cast with the counterparts therein upon a slab, securing said Eounterparts upon said slab in the position maintained by said cast, with the parting faces engaging said slab, removing said 36 cast, and preparing said counterparts and slab for immersion in a plating bath for electro deposition on said counterparts. 4. A method of preparing a cathode for the electro deposition of the working surface of I 40 a multiple core box consisting of laying out a plurality of split cores,'molding a pattern of a core drier over said split cores, casting a core drier from said pattern, fitting said Split cores in said drier, locating the counters parts of said split cores in matched registration upon'said split cores, forming a cast over said counterparts, laying said cast with the counterparts thereinupon a slab, securing said counterparts upon said slab in the posi- 80 tion maintained by said cast, with the parting faces engaging said slab, removing said cast,

and preparing said counterpaigts'and slab for immersion in a plating bath for electro deposition on said counterparts, laying the core v drier with the first named split cores therein upon another slab, and similarly securing.

said split cores upon said slab, removing the drier from said split cores, and preparing the slab and split cores for immersion -in a 00 plating bath and for electro deposition upon said split cores.

In, testimony whereof I aflix my signature. v JOHN. H. LAUKEILL 

